Department of Decision Sciences

Permanent link for this collection


Recent Submissions

Now showing 1 - 5 of 54
  • Item
    Cash assist or shark loan? In quest of doing well while doing good
    (2022) Taleb, Ali; Ghosh, Subhadip
    Jim Kamal, 24 years, was a socially-conscious entrepreneur at hart. He just completed his undergrad studies in Accounting and was exploring the opportunity of starting a Payday Loan business. While doing market research, he came across various information that made his decision difficult. On the one hand, the opportunity appeared to have great potential for superior return on investment. On the other hand, the industry clearly suffered from a bad image due to what the press and government representatives qualified as unethical commercial practices. This was in contradiction with Kamal's personal values and professional objective - doing good while doing well.
  • Item
    Clone resistant mutual authentication for low-cost RFID and contactless credit cards
    (2007) Lemieux, Stephane; Tang, Adrian
    With Radio Frequency Identification (RFID) tags being used to secure contactless credit cards, great benefits but also serious security and information privacy issues have arisen. Recently many attempts have been made to resolve these issues. In particular, attempts have been made to provide a means for authentication between tag and reader. However, none have yet have been able to provide resistance to cloning attacks. Furthermore, authentication on lowest range of low-cost RFID tags, also remains a challenge. We propose a clone resistant, mutual authentication scheme that requires only 32 bits of read write memory, 90 bits of read only memory and can be deployed using as few as 300 logic gates. We also propose a stream cipher with the same memory constraints and magnitude of logic gates. These systems may also be scaled to provide a high level of security, using relatively little computational resources, on larger hardware platforms.
  • Item
    MacEwan University at the TREC 2020 Fair Ranking Track
    (2020) Almquist, Brian
    The MacEwan University School of Business submitted two runs for the TREC 2020 Fair Ranking Track. For this task, we indexed the document abstracts and the associated metadata from the provided Semantic Scholar dataset into a single Solr1 node using a standard Tokenizer chain. For each of the evaluation queries, we executed a query for each of the documents that required reranking. For each query-document pairing, we collected the BM25 similarity score for the “paperAbstract” and “title” fields. Each of the documents are ranked for each field based on the similarity score with the query text, with ties sharing their combined rank. This resulted in two ranked lists for each query.
  • Item
    Vinyl as fine wine: the role of expectation on the perception of music format
    (2022) Enstroem, Rickard; Schmaltz, Rodney
    While vinyl, compact discs, and even eight-track tapes were traditionally promoted to consumers as producing superior sound, the introduction of compressed digital music, such as mp3s, was markedly different. Initially, one of the primary selling features of digital music was convenience and portability rather than sound quality. Recently, vinyl music sales have experienced a substantial resurgence. Waveforms from vinyl represent recorded music more accurately than compressed digital formats and have the potential to produce better sound. Even so, most music listeners do not reliably listen to music on audiophile quality high-end equipment. For this reason, we believe one aspect of vinyl sales is the expectation that vinyl quality is superior. In this study, we sought to isolate the contribution of expectation to perceived sound quality. Participants were asked to listen to a selection of music on either vinyl or mp3. Some participants were told that they were listening to vinyl when the musical selection was an mp3, while others were told they were listening to an mp3 while actually listening to vinyl. A multivariate analysis through a Canonical Correlation Analysis established that expectation of music format quality drove post-listening evaluations.
  • Item
    Social as much as environmental: The drivers of tree biomass in smallholder forest landscape restoration programmes
    (2020) Wells, Geoff J.; Fisher, Janet; Jindal, Rohit; Ryan, Casey M.
    A major challenge for forest landscape restoration initiatives is the lack of quantitative evidence on how social factors drive environmental outcomes. Here we conduct an interdisciplinary quantitative analysis of the environmental and social drivers of tree biomass accumulation across 639 smallholder farms restoring native tree species in Mexico, Uganda and Mozambique. We use environmental and social data to assess the relative effects of key hypothesised drivers on aboveground biomass accumulation at the farm-level over ten years. We supplement this with a qualitative analysis of perspectives from local farmers and agroforestry technicians on the potential causal mechanisms of the observed social effects. We find that the material wellbeing of farmers (e.g. assets) and access to agroforestry knowledge explain as much variation in biomass as water availability. Local perspectives suggest that this is caused by the higher adaptive capacity of some farmers and their associated ability to respond to social-ecological shocks and stresses. Additionally, the variation in biomass between farms increased over time. Local perspectives suggested that this was caused by emergent exogenous and stochastic influences which cannot be reliably predicted in technical analyses and guidance. To deal with this persistent uncertainty, local perspectives emphasised the need for flexible and adaptive processes at the farm- and village-levels. The consistency of these findings across three countries suggests these findings are relevant to similar forest restoration interventions. Our findings provide novel quantitative evidence of a social-ecological pathway where the adaptive capacity of local land users can improve ecological processes. Our findings emphasize the need for forest restoration programmes to prioritise investment in the capabilities of local land users, and to ensure that rules support, rather than hinder, adaptive management.